1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1995 Linus Torvalds 7 * Copyright (C) 1995 Waldorf Electronics 8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle 9 * Copyright (C) 1996 Stoned Elipot 10 * Copyright (C) 1999 Silicon Graphics, Inc. 11 * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki 12 */ 13 #include <linux/init.h> 14 #include <linux/ioport.h> 15 #include <linux/export.h> 16 #include <linux/screen_info.h> 17 #include <linux/memblock.h> 18 #include <linux/initrd.h> 19 #include <linux/root_dev.h> 20 #include <linux/highmem.h> 21 #include <linux/console.h> 22 #include <linux/pfn.h> 23 #include <linux/debugfs.h> 24 #include <linux/kexec.h> 25 #include <linux/sizes.h> 26 #include <linux/device.h> 27 #include <linux/dma-contiguous.h> 28 #include <linux/decompress/generic.h> 29 #include <linux/of_fdt.h> 30 #include <linux/of_reserved_mem.h> 31 32 #include <asm/addrspace.h> 33 #include <asm/bootinfo.h> 34 #include <asm/bugs.h> 35 #include <asm/cache.h> 36 #include <asm/cdmm.h> 37 #include <asm/cpu.h> 38 #include <asm/debug.h> 39 #include <asm/dma-coherence.h> 40 #include <asm/sections.h> 41 #include <asm/setup.h> 42 #include <asm/smp-ops.h> 43 #include <asm/prom.h> 44 45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 46 const char __section(.appended_dtb) __appended_dtb[0x100000]; 47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 48 49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 50 51 EXPORT_SYMBOL(cpu_data); 52 53 #ifdef CONFIG_VT 54 struct screen_info screen_info; 55 #endif 56 57 /* 58 * Setup information 59 * 60 * These are initialized so they are in the .data section 61 */ 62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; 63 64 EXPORT_SYMBOL(mips_machtype); 65 66 static char __initdata command_line[COMMAND_LINE_SIZE]; 67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; 68 69 #ifdef CONFIG_CMDLINE_BOOL 70 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE; 71 #else 72 static const char builtin_cmdline[] __initconst = ""; 73 #endif 74 75 /* 76 * mips_io_port_base is the begin of the address space to which x86 style 77 * I/O ports are mapped. 78 */ 79 unsigned long mips_io_port_base = -1; 80 EXPORT_SYMBOL(mips_io_port_base); 81 82 static struct resource code_resource = { .name = "Kernel code", }; 83 static struct resource data_resource = { .name = "Kernel data", }; 84 static struct resource bss_resource = { .name = "Kernel bss", }; 85 86 static void *detect_magic __initdata = detect_memory_region; 87 88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 89 unsigned long ARCH_PFN_OFFSET; 90 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 91 #endif 92 93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) 94 { 95 /* 96 * Note: This function only exists for historical reason, 97 * new code should use memblock_add or memblock_add_node instead. 98 */ 99 100 /* 101 * If the region reaches the top of the physical address space, adjust 102 * the size slightly so that (start + size) doesn't overflow 103 */ 104 if (start + size - 1 == PHYS_ADDR_MAX) 105 --size; 106 107 /* Sanity check */ 108 if (start + size < start) { 109 pr_warn("Trying to add an invalid memory region, skipped\n"); 110 return; 111 } 112 113 if (start < PHYS_OFFSET) 114 return; 115 116 memblock_add(start, size); 117 /* Reserve any memory except the ordinary RAM ranges. */ 118 switch (type) { 119 case BOOT_MEM_RAM: 120 break; 121 122 case BOOT_MEM_NOMAP: /* Discard the range from the system. */ 123 memblock_remove(start, size); 124 break; 125 126 default: /* Reserve the rest of the memory types at boot time */ 127 memblock_reserve(start, size); 128 break; 129 } 130 } 131 132 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 133 { 134 void *dm = &detect_magic; 135 phys_addr_t size; 136 137 for (size = sz_min; size < sz_max; size <<= 1) { 138 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 139 break; 140 } 141 142 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 143 ((unsigned long long) size) / SZ_1M, 144 (unsigned long long) start, 145 ((unsigned long long) sz_min) / SZ_1M, 146 ((unsigned long long) sz_max) / SZ_1M); 147 148 add_memory_region(start, size, BOOT_MEM_RAM); 149 } 150 151 /* 152 * Manage initrd 153 */ 154 #ifdef CONFIG_BLK_DEV_INITRD 155 156 static int __init rd_start_early(char *p) 157 { 158 unsigned long start = memparse(p, &p); 159 160 #ifdef CONFIG_64BIT 161 /* Guess if the sign extension was forgotten by bootloader */ 162 if (start < XKPHYS) 163 start = (int)start; 164 #endif 165 initrd_start = start; 166 initrd_end += start; 167 return 0; 168 } 169 early_param("rd_start", rd_start_early); 170 171 static int __init rd_size_early(char *p) 172 { 173 initrd_end += memparse(p, &p); 174 return 0; 175 } 176 early_param("rd_size", rd_size_early); 177 178 /* it returns the next free pfn after initrd */ 179 static unsigned long __init init_initrd(void) 180 { 181 unsigned long end; 182 183 /* 184 * Board specific code or command line parser should have 185 * already set up initrd_start and initrd_end. In these cases 186 * perfom sanity checks and use them if all looks good. 187 */ 188 if (!initrd_start || initrd_end <= initrd_start) 189 goto disable; 190 191 if (initrd_start & ~PAGE_MASK) { 192 pr_err("initrd start must be page aligned\n"); 193 goto disable; 194 } 195 if (initrd_start < PAGE_OFFSET) { 196 pr_err("initrd start < PAGE_OFFSET\n"); 197 goto disable; 198 } 199 200 /* 201 * Sanitize initrd addresses. For example firmware 202 * can't guess if they need to pass them through 203 * 64-bits values if the kernel has been built in pure 204 * 32-bit. We need also to switch from KSEG0 to XKPHYS 205 * addresses now, so the code can now safely use __pa(). 206 */ 207 end = __pa(initrd_end); 208 initrd_end = (unsigned long)__va(end); 209 initrd_start = (unsigned long)__va(__pa(initrd_start)); 210 211 ROOT_DEV = Root_RAM0; 212 return PFN_UP(end); 213 disable: 214 initrd_start = 0; 215 initrd_end = 0; 216 return 0; 217 } 218 219 /* In some conditions (e.g. big endian bootloader with a little endian 220 kernel), the initrd might appear byte swapped. Try to detect this and 221 byte swap it if needed. */ 222 static void __init maybe_bswap_initrd(void) 223 { 224 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 225 u64 buf; 226 227 /* Check for CPIO signature */ 228 if (!memcmp((void *)initrd_start, "070701", 6)) 229 return; 230 231 /* Check for compressed initrd */ 232 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 233 return; 234 235 /* Try again with a byte swapped header */ 236 buf = swab64p((u64 *)initrd_start); 237 if (!memcmp(&buf, "070701", 6) || 238 decompress_method((unsigned char *)(&buf), 8, NULL)) { 239 unsigned long i; 240 241 pr_info("Byteswapped initrd detected\n"); 242 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 243 swab64s((u64 *)i); 244 } 245 #endif 246 } 247 248 static void __init finalize_initrd(void) 249 { 250 unsigned long size = initrd_end - initrd_start; 251 252 if (size == 0) { 253 printk(KERN_INFO "Initrd not found or empty"); 254 goto disable; 255 } 256 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 257 printk(KERN_ERR "Initrd extends beyond end of memory"); 258 goto disable; 259 } 260 261 maybe_bswap_initrd(); 262 263 memblock_reserve(__pa(initrd_start), size); 264 initrd_below_start_ok = 1; 265 266 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 267 initrd_start, size); 268 return; 269 disable: 270 printk(KERN_CONT " - disabling initrd\n"); 271 initrd_start = 0; 272 initrd_end = 0; 273 } 274 275 #else /* !CONFIG_BLK_DEV_INITRD */ 276 277 static unsigned long __init init_initrd(void) 278 { 279 return 0; 280 } 281 282 #define finalize_initrd() do {} while (0) 283 284 #endif 285 286 /* 287 * Initialize the bootmem allocator. It also setup initrd related data 288 * if needed. 289 */ 290 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) 291 292 static void __init bootmem_init(void) 293 { 294 init_initrd(); 295 finalize_initrd(); 296 } 297 298 #else /* !CONFIG_SGI_IP27 */ 299 300 static void __init bootmem_init(void) 301 { 302 struct memblock_region *mem; 303 phys_addr_t ramstart, ramend; 304 305 ramstart = memblock_start_of_DRAM(); 306 ramend = memblock_end_of_DRAM(); 307 308 /* 309 * Sanity check any INITRD first. We don't take it into account 310 * for bootmem setup initially, rely on the end-of-kernel-code 311 * as our memory range starting point. Once bootmem is inited we 312 * will reserve the area used for the initrd. 313 */ 314 init_initrd(); 315 316 /* Reserve memory occupied by kernel. */ 317 memblock_reserve(__pa_symbol(&_text), 318 __pa_symbol(&_end) - __pa_symbol(&_text)); 319 320 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 321 322 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 323 ARCH_PFN_OFFSET = PFN_UP(ramstart); 324 #else 325 /* 326 * Reserve any memory between the start of RAM and PHYS_OFFSET 327 */ 328 if (ramstart > PHYS_OFFSET) 329 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 330 331 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 332 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 333 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 334 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 335 } 336 #endif 337 338 min_low_pfn = ARCH_PFN_OFFSET; 339 max_pfn = PFN_DOWN(ramend); 340 for_each_memblock(memory, mem) { 341 unsigned long start = memblock_region_memory_base_pfn(mem); 342 unsigned long end = memblock_region_memory_end_pfn(mem); 343 344 /* 345 * Skip highmem here so we get an accurate max_low_pfn if low 346 * memory stops short of high memory. 347 * If the region overlaps HIGHMEM_START, end is clipped so 348 * max_pfn excludes the highmem portion. 349 */ 350 if (memblock_is_nomap(mem)) 351 continue; 352 if (start >= PFN_DOWN(HIGHMEM_START)) 353 continue; 354 if (end > PFN_DOWN(HIGHMEM_START)) 355 end = PFN_DOWN(HIGHMEM_START); 356 if (end > max_low_pfn) 357 max_low_pfn = end; 358 } 359 360 if (min_low_pfn >= max_low_pfn) 361 panic("Incorrect memory mapping !!!"); 362 363 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 364 #ifdef CONFIG_HIGHMEM 365 highstart_pfn = PFN_DOWN(HIGHMEM_START); 366 highend_pfn = max_pfn; 367 #else 368 max_low_pfn = PFN_DOWN(HIGHMEM_START); 369 max_pfn = max_low_pfn; 370 #endif 371 } 372 373 374 /* 375 * In any case the added to the memblock memory regions 376 * (highmem/lowmem, available/reserved, etc) are considered 377 * as present, so inform sparsemem about them. 378 */ 379 memblocks_present(); 380 381 /* 382 * Reserve initrd memory if needed. 383 */ 384 finalize_initrd(); 385 } 386 387 #endif /* CONFIG_SGI_IP27 */ 388 389 static int usermem __initdata; 390 391 static int __init early_parse_mem(char *p) 392 { 393 phys_addr_t start, size; 394 395 /* 396 * If a user specifies memory size, we 397 * blow away any automatically generated 398 * size. 399 */ 400 if (usermem == 0) { 401 usermem = 1; 402 memblock_remove(memblock_start_of_DRAM(), 403 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 404 } 405 start = 0; 406 size = memparse(p, &p); 407 if (*p == '@') 408 start = memparse(p + 1, &p); 409 410 add_memory_region(start, size, BOOT_MEM_RAM); 411 412 return 0; 413 } 414 early_param("mem", early_parse_mem); 415 416 static int __init early_parse_memmap(char *p) 417 { 418 char *oldp; 419 u64 start_at, mem_size; 420 421 if (!p) 422 return -EINVAL; 423 424 if (!strncmp(p, "exactmap", 8)) { 425 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 426 return 0; 427 } 428 429 oldp = p; 430 mem_size = memparse(p, &p); 431 if (p == oldp) 432 return -EINVAL; 433 434 if (*p == '@') { 435 start_at = memparse(p+1, &p); 436 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 437 } else if (*p == '#') { 438 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 439 return -EINVAL; 440 } else if (*p == '$') { 441 start_at = memparse(p+1, &p); 442 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED); 443 } else { 444 pr_err("\"memmap\" invalid format!\n"); 445 return -EINVAL; 446 } 447 448 if (*p == '\0') { 449 usermem = 1; 450 return 0; 451 } else 452 return -EINVAL; 453 } 454 early_param("memmap", early_parse_memmap); 455 456 #ifdef CONFIG_PROC_VMCORE 457 unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 458 static int __init early_parse_elfcorehdr(char *p) 459 { 460 struct memblock_region *mem; 461 462 setup_elfcorehdr = memparse(p, &p); 463 464 for_each_memblock(memory, mem) { 465 unsigned long start = mem->base; 466 unsigned long end = start + mem->size; 467 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { 468 /* 469 * Reserve from the elf core header to the end of 470 * the memory segment, that should all be kdump 471 * reserved memory. 472 */ 473 setup_elfcorehdr_size = end - setup_elfcorehdr; 474 break; 475 } 476 } 477 /* 478 * If we don't find it in the memory map, then we shouldn't 479 * have to worry about it, as the new kernel won't use it. 480 */ 481 return 0; 482 } 483 early_param("elfcorehdr", early_parse_elfcorehdr); 484 #endif 485 486 #ifdef CONFIG_KEXEC 487 static void __init mips_parse_crashkernel(void) 488 { 489 unsigned long long total_mem; 490 unsigned long long crash_size, crash_base; 491 int ret; 492 493 total_mem = memblock_phys_mem_size(); 494 ret = parse_crashkernel(boot_command_line, total_mem, 495 &crash_size, &crash_base); 496 if (ret != 0 || crash_size <= 0) 497 return; 498 499 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) { 500 pr_warn("Invalid memory region reserved for crash kernel\n"); 501 return; 502 } 503 504 crashk_res.start = crash_base; 505 crashk_res.end = crash_base + crash_size - 1; 506 } 507 508 static void __init request_crashkernel(struct resource *res) 509 { 510 int ret; 511 512 if (crashk_res.start == crashk_res.end) 513 return; 514 515 ret = request_resource(res, &crashk_res); 516 if (!ret) 517 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 518 (unsigned long)(resource_size(&crashk_res) >> 20), 519 (unsigned long)(crashk_res.start >> 20)); 520 } 521 #else /* !defined(CONFIG_KEXEC) */ 522 static void __init mips_parse_crashkernel(void) 523 { 524 } 525 526 static void __init request_crashkernel(struct resource *res) 527 { 528 } 529 #endif /* !defined(CONFIG_KEXEC) */ 530 531 static void __init check_kernel_sections_mem(void) 532 { 533 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text))); 534 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start; 535 536 if (!memblock_is_region_memory(start, size)) { 537 pr_info("Kernel sections are not in the memory maps\n"); 538 memblock_add(start, size); 539 } 540 } 541 542 static void __init bootcmdline_append(const char *s, size_t max) 543 { 544 if (!s[0] || !max) 545 return; 546 547 if (boot_command_line[0]) 548 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 549 550 strlcat(boot_command_line, s, max); 551 } 552 553 #ifdef CONFIG_OF_EARLY_FLATTREE 554 555 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname, 556 int depth, void *data) 557 { 558 bool *dt_bootargs = data; 559 const char *p; 560 int l; 561 562 if (depth != 1 || !data || 563 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) 564 return 0; 565 566 p = of_get_flat_dt_prop(node, "bootargs", &l); 567 if (p != NULL && l > 0) { 568 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE)); 569 *dt_bootargs = true; 570 } 571 572 return 1; 573 } 574 575 #endif /* CONFIG_OF_EARLY_FLATTREE */ 576 577 static void __init bootcmdline_init(char **cmdline_p) 578 { 579 bool dt_bootargs = false; 580 581 /* 582 * If CMDLINE_OVERRIDE is enabled then initializing the command line is 583 * trivial - we simply use the built-in command line unconditionally & 584 * unmodified. 585 */ 586 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 587 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 588 return; 589 } 590 591 /* 592 * If the user specified a built-in command line & 593 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is 594 * prepended to arguments from the bootloader or DT so we'll copy them 595 * to the start of boot_command_line here. Otherwise, empty 596 * boot_command_line to undo anything early_init_dt_scan_chosen() did. 597 */ 598 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 599 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 600 else 601 boot_command_line[0] = 0; 602 603 #ifdef CONFIG_OF_EARLY_FLATTREE 604 /* 605 * If we're configured to take boot arguments from DT, look for those 606 * now. 607 */ 608 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) || 609 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)) 610 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs); 611 #endif 612 613 /* 614 * If we didn't get any arguments from DT (regardless of whether that's 615 * because we weren't configured to look for them, or because we looked 616 * & found none) then we'll take arguments from the bootloader. 617 * plat_mem_setup() should have filled arcs_cmdline with arguments from 618 * the bootloader. 619 */ 620 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs) 621 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE); 622 623 /* 624 * If the user specified a built-in command line & we didn't already 625 * prepend it, we append it to boot_command_line here. 626 */ 627 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && 628 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 629 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE); 630 } 631 632 /* 633 * arch_mem_init - initialize memory management subsystem 634 * 635 * o plat_mem_setup() detects the memory configuration and will record detected 636 * memory areas using add_memory_region. 637 * 638 * At this stage the memory configuration of the system is known to the 639 * kernel but generic memory management system is still entirely uninitialized. 640 * 641 * o bootmem_init() 642 * o sparse_init() 643 * o paging_init() 644 * o dma_contiguous_reserve() 645 * 646 * At this stage the bootmem allocator is ready to use. 647 * 648 * NOTE: historically plat_mem_setup did the entire platform initialization. 649 * This was rather impractical because it meant plat_mem_setup had to 650 * get away without any kind of memory allocator. To keep old code from 651 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 652 * initialization hook for anything else was introduced. 653 */ 654 static void __init arch_mem_init(char **cmdline_p) 655 { 656 extern void plat_mem_setup(void); 657 658 /* call board setup routine */ 659 plat_mem_setup(); 660 memblock_set_bottom_up(true); 661 662 bootcmdline_init(cmdline_p); 663 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 664 *cmdline_p = command_line; 665 666 parse_early_param(); 667 668 if (usermem) 669 pr_info("User-defined physical RAM map overwrite\n"); 670 671 check_kernel_sections_mem(); 672 673 early_init_fdt_reserve_self(); 674 early_init_fdt_scan_reserved_mem(); 675 676 #ifndef CONFIG_NUMA 677 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 678 #endif 679 bootmem_init(); 680 681 /* 682 * Prevent memblock from allocating high memory. 683 * This cannot be done before max_low_pfn is detected, so up 684 * to this point is possible to only reserve physical memory 685 * with memblock_reserve; memblock_alloc* can be used 686 * only after this point 687 */ 688 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 689 690 #ifdef CONFIG_PROC_VMCORE 691 if (setup_elfcorehdr && setup_elfcorehdr_size) { 692 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 693 setup_elfcorehdr, setup_elfcorehdr_size); 694 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size); 695 } 696 #endif 697 698 mips_parse_crashkernel(); 699 #ifdef CONFIG_KEXEC 700 if (crashk_res.start != crashk_res.end) 701 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 702 #endif 703 device_tree_init(); 704 sparse_init(); 705 plat_swiotlb_setup(); 706 707 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 708 709 /* Reserve for hibernation. */ 710 memblock_reserve(__pa_symbol(&__nosave_begin), 711 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 712 713 fdt_init_reserved_mem(); 714 715 memblock_dump_all(); 716 717 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 718 } 719 720 static void __init resource_init(void) 721 { 722 struct memblock_region *region; 723 724 if (UNCAC_BASE != IO_BASE) 725 return; 726 727 code_resource.start = __pa_symbol(&_text); 728 code_resource.end = __pa_symbol(&_etext) - 1; 729 data_resource.start = __pa_symbol(&_etext); 730 data_resource.end = __pa_symbol(&_edata) - 1; 731 bss_resource.start = __pa_symbol(&__bss_start); 732 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 733 734 for_each_memblock(memory, region) { 735 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region)); 736 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1; 737 struct resource *res; 738 739 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 740 if (!res) 741 panic("%s: Failed to allocate %zu bytes\n", __func__, 742 sizeof(struct resource)); 743 744 res->start = start; 745 res->end = end; 746 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 747 res->name = "System RAM"; 748 749 request_resource(&iomem_resource, res); 750 751 /* 752 * We don't know which RAM region contains kernel data, 753 * so we try it repeatedly and let the resource manager 754 * test it. 755 */ 756 request_resource(res, &code_resource); 757 request_resource(res, &data_resource); 758 request_resource(res, &bss_resource); 759 request_crashkernel(res); 760 } 761 } 762 763 #ifdef CONFIG_SMP 764 static void __init prefill_possible_map(void) 765 { 766 int i, possible = num_possible_cpus(); 767 768 if (possible > nr_cpu_ids) 769 possible = nr_cpu_ids; 770 771 for (i = 0; i < possible; i++) 772 set_cpu_possible(i, true); 773 for (; i < NR_CPUS; i++) 774 set_cpu_possible(i, false); 775 776 nr_cpu_ids = possible; 777 } 778 #else 779 static inline void prefill_possible_map(void) {} 780 #endif 781 782 void __init setup_arch(char **cmdline_p) 783 { 784 cpu_probe(); 785 mips_cm_probe(); 786 prom_init(); 787 788 setup_early_fdc_console(); 789 #ifdef CONFIG_EARLY_PRINTK 790 setup_early_printk(); 791 #endif 792 cpu_report(); 793 check_bugs_early(); 794 795 #if defined(CONFIG_VT) 796 #if defined(CONFIG_VGA_CONSOLE) 797 conswitchp = &vga_con; 798 #endif 799 #endif 800 801 arch_mem_init(cmdline_p); 802 803 resource_init(); 804 plat_smp_setup(); 805 prefill_possible_map(); 806 807 cpu_cache_init(); 808 paging_init(); 809 } 810 811 unsigned long kernelsp[NR_CPUS]; 812 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 813 814 #ifdef CONFIG_USE_OF 815 unsigned long fw_passed_dtb; 816 #endif 817 818 #ifdef CONFIG_DEBUG_FS 819 struct dentry *mips_debugfs_dir; 820 static int __init debugfs_mips(void) 821 { 822 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 823 return 0; 824 } 825 arch_initcall(debugfs_mips); 826 #endif 827 828 #ifdef CONFIG_DMA_MAYBE_COHERENT 829 /* User defined DMA coherency from command line. */ 830 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; 831 EXPORT_SYMBOL_GPL(coherentio); 832 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ 833 834 static int __init setcoherentio(char *str) 835 { 836 coherentio = IO_COHERENCE_ENABLED; 837 pr_info("Hardware DMA cache coherency (command line)\n"); 838 return 0; 839 } 840 early_param("coherentio", setcoherentio); 841 842 static int __init setnocoherentio(char *str) 843 { 844 coherentio = IO_COHERENCE_DISABLED; 845 pr_info("Software DMA cache coherency (command line)\n"); 846 return 0; 847 } 848 early_param("nocoherentio", setnocoherentio); 849 #endif 850